We cannot serve anyone with whom we have animosity. This is why the Gospels stress forgiveness. Our Lord even forgave those who crucified Him, crying out from the cross, "Father, forgive them; for they know not what they do." (Luke 23:34) If we are to serve the world, we must first be able to forgive everyone and anyone. The slightest amount of unforgiveness or anger towards anyone is enough to keep us from God, for in God there is only love.